I disagree that the 5’s need a HUGE room. I have a fairly small room and use 5’s and they sound quite good. A bigger room would be better, but it’s not a necessity. Having said that, the Quatro Wood may be a better choice for a small room. I got my 5’s here for $5k several years ago, at the time Quatro Woods were fairly new so very few used for sale and when they came up they were in the $7k range. The bigger issue is finding a used pair, don’t see them too often so if you are picky about which wood species you want then you may have to have a lot of patience. Good luck!
Choice of Vandersteen models
Assume the price for either will be the same. Quatro Wood(not the CT), or the 5 (not the 5a or CT). Both in excellent condition. Don't discuss alternative speakers, other than these two. Which will sound better, which will hold value better. I have Modwright OPPO 105, and NAD 375BEE amp, 150 Watts Per 2 channel.